I never heard of decimals in this type of question before 5=4.5+c

I'm not sure what you're even trying to find since you didn't specify but if you are trying to find the value of 'c' :

0.5 = c

Reason:

5 - 4.5 = 0.5

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3